Flash Dolby Digital Plus on Android Phones
Dolby Digital Plus is a sound enhancement software, and here you can get the instructions and links to flash it in android devices. Currently, only android devices starting from Android Marshmallow (6.0) to Android Pie (9.0) is supported.
You can flash this with TWRP or Magisk
For TWRP: Androidfilehost
Uninstaller for TWRP: Androidfilehost
XDA Discussion: XDA